Verify: (sin x + sin y)/ (cos x + cos y) = tan((x+y/2))?

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... x+y)/2)*cos((x-y)/2) cos(x)-cos(y) = -2*sin((x+y)/2)*sin((x-y)/2) tan(x)+tan(y ... y) = (cos(x-y)+cos(x+y))/2 sin(x)*cos(y) = (sin(x-y)+sin(x+y))/2 sin ...
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Positive: 93 %

Trigonometric Functions of Acute Angles sin X = opp / hyp = a / c , csc X = hyp / opp = c / a tan X = opp / adj = a / b , cot X = adj / opp = b / a
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Positive: 90 %

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Positive: 51 %

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Positive: 92 %

sin 2 (x) + cos 2 (x) = 1. tan 2 (x) + 1 = sec 2 (x) cot 2 (x) + 1 = csc 2 (x) sin(x y) = sin x cos y cos x sin y. cos(x y) = cos x cosy sin x sin y
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Positive: 87 %

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Positive: 80 %

Lists the basic trigonometric identities, ... where sin(t) = y, cos(t) ... sin(2x) = 2sin(x)cos(x) cos(2x) ...
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Positive: 70 %

A http://www.door2math.com production. verifying trig identity? I need to know how to verify the identity sin(π/2+x) = cos(x)
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Positive: 57 %

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Positive: 41 %

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Positive: 22 %

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93 %